Correction: I counted only 11 major Maker Faires (not dozens), but there are 61 mini-Maker Faires in 2013.
The largest Maker Faire is the original Bay Area event, and they had around 120k people this year.
Here are the cities with major Maker Faires:
Seoul (Korea)
Raleigh (NC)
Kansas City (KS)
Detroit (MI)
Hannover (Germany)
Fort Wayne Regional (IN)
World New York (NYC)
Rome (Italy)
Bay Area (San Mateo, CA)
Taipei (Taiwan)
Newcastle (UK)

There are dozens of major Maker Faire events in major cities (Bay Area, New York, Detroit, Rome...) and mini-Maker Faires in smaller cities.
http://makerfaire.com/
Here's a list of the upcoming Faires:
http://makerfaire.com/map/
I count 50 upcoming Faires this year.

In conjunction with unveiling of EE Times’ Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. One of Silicon Valley's great contributions to the world has been the demonstration of how the application of entrepreneurship and venture capital to electronics and semiconductor hardware can create wealth with developments in semiconductors, displays, design automation, MEMS and across the breadth of hardware developments. But in recent years concerns have been raised that traditional venture capital has turned its back on hardware-related startups in favor of software and Internet applications and services. Panelists from incubators join Peter Clarke in debate.